Python Pandas - Create Multiindex from arrays

We will see how to create multiindex from arrays using the MultiIndex.from_arrays(). At first, let us create an array of cars −

car = ['Audi', 'Lexus', 'Tesla', 'Mercedes', 'BMW', 'Toyota', 'Nissan', 'Bentley', 'Mustang']

Create another array for our example, that would include the Registration Price −

reg_price = [1000, 1400, 1100, 900, 1700, 1800, 1300, 1150, 1350]

Now, we will use the MultiIndex.from_arrays(). Also set the names for the levels in the index.

Example

Following is the code −

import pandas as pd

# array of cars
car = ['Audi', 'Lexus', 'Tesla', 'Mercedes', 'BMW', 'Toyota', 'Nissan', 'Bentley', 'Mustang']

# array of registration price
reg_price = [1000, 1400, 1100, 900, 1700, 1800, 1300, 1150, 1350]

# Combining arrays and creating multi-index
print(pd.MultiIndex.from_arrays([car, reg_price], names=('car', 'reg_price')))

Output

This will produce the following output −

MultiIndex(levels=[[u'Audi', u'BMW', u'Bentley', u'Lexus', u'Mercedes', u'Mustang', u'Nissan', u'Tesla', u'Toyota'], [900, 1000, 1100, 1150, 1300, 1350, 1400, 1700, 1800]],
           labels=[[0, 3, 7, 4, 1, 8, 6, 2, 5], [1, 6, 2, 0, 7, 8, 4, 3, 5]],
           names=[u'car', u'reg_price'])

AmitDiwan

Updated on: 20-Sep-2021

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